Hey there, I just experienced a crash that the log pointed towards clumps being the potential cause. I right clicked an XP Tome (https://www.curseforge.com/minecraft/mc-mods/xp-tome) that had some xp stored so I could repair my mending pickaxe on hand, and it caused this crash while in the nether.
crash-2023-12-05_16.24.45-server.txt

Using Forge 47.2.8, Clumps 12.0.0.3, and XP Tome 2.2 when this happened. I've done this exact behavior before without any crash so I'm unsure what specific caused it.

Closing due to no reply and no one else reporting the same.

can you please screenshot the tooltip of your mending pickaxe please.

Are you able to reproduce the crash?

no, this is the first time and only time this has happened / I've done similar behaviors before/after with no crash.

Only thing I could maybe think of here is due to AdvancedNetherite's higher durability values causing some issue with the mending process. Otherwise I don't know.

Also after the crash my tool was properly repaired and the xp was given with no like xp duplication, so the process did save.

Would you be able to do a test by having the pickaxe at a very low durability and then using the xp tomb to repair it, and see if it works or not.